The name Frankfurt first appears in writing…

The name Frankfurt first appears in writing in the year 794, when a letter from the Emperor to the bishop of Toledo contained "in loco celebri, qui dicitur Franconofurd," which reads "that famous place, which is called Frankfurt."

Emperor Louis makes the city of Frankfurt-am-Main his headquarters, and has a large palace erected there in 822. (Today a European banking metropolis, Frankfurt is the largest city in the German state of Hesse and the fifth-largest city in Germany.)